pelton



(No Model.)

T. G. PELTON.

EXPANDING ROSE BIT.

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l l NITED STATES PATENT OFFICE.

THEODORE G. PELTON, OF LYONS, IOWA, ASSIGNOR OF ONEHALF TO JERRY M. PELTON, OF SAME PLACE.

yEXPANDING ROSE-BIT.

SPECIFICATION forming part of Letters Patent No. 270,554, dated January 9, 1883.

Application filed July 29, 1882.

T o all whom it may concern:

-Be it known that I, T. G. PELTON, a citizen of the United States of America, residing at Lyons, in the county of Clinton and State of 5 Iowa, have invented certain new andv useful Improvements in Rose-Expanding Beamers, of which the following is a specification, refereuce being had therein tothe accompanying drawings.

io My invention consists ofan expansible reamer, the body of which is constructed ofone piece of steel, having a central tapered hole and lateral slots, the tapered hole being provided with a tapered set-screw, whereby the cutting 15 end et' the reamer may be expanded within the limits of the spring` of the metal.

Figure l is side view of the reamer. Fig. 2 is a longitudinal section ou line b of Fig. 4. Fig. 3 shows the cutting end. Fig. 4 is a crosszo seotonfon line a of Fig. 2.

The main body of the reamer A is made of one piece of steel, and a central tapered hole, l), is drilled therein the required depth to allow the requisite spring for the expansion of z5 the cutting end of the reamer, the walls of said hole being` screw-threaded. The tapered screw is then littcd in the tapered hole. The screw is then removed, and the slots c cut through the body ofthe drill, extending laterally from 3o the outside to the central hole, and longitudinally the length of the hole. E represents the cutting-lips.

Itis well known to be difficult to drill through an iron substance a hole the exact size re- 35 quired. This tool, which is very simple and (No model.)

readily constructed, is designed to relieve that difficulty.

To illustrate its use, take, for example, au iron pulley to be fitted on a straight shaft and drill through the pulley a hole slightly less 4o than the size of the shaft. Then take one ot' theseexpansibledrill the normal sizeof which is slightly less than the required hole, and bymeans of the set-screw expand carefully the cutting end, being careful it is not larger than 45 the required size, and reaui out the hole; and by several trials the reamer may thus be expanded to the exact size to realn the hole to lit the shaft closely or loosely, as required.

The natural elasticity ofthe metal will allow 5o the reainer to be expanded about one-eighth of an inch, and by having a s et of graduated sizes of these rea-mers, a hole of any required size may be readily made.

What I claim as new, and desire to secure by S5 Letters Pat-ent, is-

The herein-described expansible rose-bit, divided longitudinally in three equal bearing parts by the side slots, c, and the central hole,

D, and having its cutting lips or points E at 6o the end ot' the bit, and provided with the tapered screw B, substantially as and for the purposes set forth.

In testimony whereof I affix my signature in presence of two witnesses.

TH EODORE G. PELTON.

Witnesses W. W. SANBORN, J. M. PEL'roN. 

